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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
        /*  
            let 我要定义变量了
            let 变量名=值
            let 后必须要有一个或者多个空格
            = 赋值运算符 也可以有一个或者多个空格
        */
        let name = "jack" 
        let email = "jack@qq.com"
        let phone = "123456789"
    </script>
</body>
</html>